Desktop Aura: Allow tab drags out of window.

ui/aura/root_window_host_linux.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_AURA_ROOT_WINDOW_HOST_LINUX_H_
 #define UI_AURA_ROOT_WINDOW_HOST_LINUX_H_
 
 #include <X11/Xlib.h>
 
 // Get rid of a macro from Xlib.h that conflicts with Aura's RootWindow class.
@@ skipping 19 matching lines @@
   virtual ~RootWindowHostLinux();
 
   // Overridden from Dispatcher overrides:
   virtual bool Dispatch(const base::NativeEvent& event) OVERRIDE;
 
  private:
   // RootWindowHost Overrides.
   virtual RootWindow* GetRootWindow() OVERRIDE;
   virtual gfx::AcceleratedWidget GetAcceleratedWidget() OVERRIDE;
   virtual void Show() OVERRIDE;
+  virtual void Hide() OVERRIDE;
   virtual void ToggleFullScreen() OVERRIDE;
   virtual gfx::Rect GetBounds() const OVERRIDE;
   virtual void SetBounds(const gfx::Rect& bounds) OVERRIDE;
   virtual gfx::Point GetLocationOnNativeScreen() const OVERRIDE;
   virtual void SetCapture() OVERRIDE;
   virtual void ReleaseCapture() OVERRIDE;
   virtual void SetCursor(gfx::NativeCursor cursor_type) OVERRIDE;
   virtual void ShowCursor(bool show) OVERRIDE;
   virtual bool QueryMouseLocation(gfx::Point* location_return) OVERRIDE;
   virtual bool ConfineCursorToRootWindow() OVERRIDE;
@@ skipping 20 matching lines @@
   // The display and the native X window hosting the root window.
   Display* xdisplay_;
   ::Window xwindow_;
 
   // The native root window.
   ::Window x_root_window_;
 
   // Current Aura cursor.
   gfx::NativeCursor current_cursor_;
 
+  // Is the window mapped to the screen?
+  bool window_mapped_;
+
   // Is the cursor currently shown?
   bool cursor_shown_;
 
   // The invisible cursor.
   ::Cursor invisible_cursor_;
 
   // The bounds of |xwindow_|.
   gfx::Rect bounds_;
 
   // True if the window should be focused when the window is shown.
   bool focus_when_shown_;
 
   scoped_array<XID> pointer_barriers_;
 
   scoped_ptr<ui::ViewProp> prop_;
 
   class ImageCursors;
   scoped_ptr<ImageCursors> image_cursors_;
 
   X11AtomCache atom_cache_;
 
   DISALLOW_COPY_AND_ASSIGN(RootWindowHostLinux);
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_ROOT_WINDOW_HOST_LINUX_H_